21446642859 has 32 divisors (see below), whose sum is σ = 32613249024. Its totient is φ = 12456407040.

The previous prime is 21446642857. The next prime is 21446642887. The reversal of 21446642859 is 95824664412.

It is not a de Polignac number, because 21446642859 - 2¹ = 21446642857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (21446642851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258534 + ... + 331259.

It is an arithmetic number, because the mean of its divisors is an integer number (1019164032).

Almost surely, 2^21446642859 is an apocalyptic number.

21446642859 is a deficient number, since it is larger than the sum of its proper divisors (11166606165).

21446642859 is a wasteful number, since it uses less digits than its factorization.

21446642859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 589867.

The product of its digits is 3317760, while the sum is 51.

The spelling of 21446642859 in words is "twenty-one billion, four hundred forty-six million, six hundred forty-two thousand, eight hundred fifty-nine".